1 John 4:2

By this you know the Spirit of God: every spirit who confesses that Jesus Christ has come in the flesh is of God,

1 Corinthians 12:3

Therefore I make known to you that no man speaking by God's Spirit says, "Jesus is accursed." No one can say, "Jesus is Lord," but by the Holy Spirit.

John 1:14

The Word became flesh, and lived among us. We saw his glory, such glory as of the one and only Son of the Father, full of grace and truth.

John 16:13-15

However when he, the Spirit of truth, has come, he will guide you into all truth, for he will not speak from himself; but whatever he hears, he will speak. He will declare to you things that are coming.

1 Timothy 3:16

Without controversy, the mystery of godliness is great: God was revealed in the flesh, justified in the spirit, seen by angels, preached among the nations, believed on in the world, and received up in glory.

1 John 2:23

Whoever denies the Son, the same doesn't have the Father. He who confesses the Son has the Father also.

1 John 4:3

and every spirit who doesn't confess that Jesus Christ has come in the flesh is not of God, and this is the spirit of the Antichrist, of whom you have heard that it comes. Now it is in the world already.

1 John 5:1

Whoever believes that Jesus is the Christ is born of God. Whoever loves the Father also loves the child who is born of him.

Treasury of Scripture Knowledge

Summary

Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:

General references

Bible References

Come

1 John 4:3
and every spirit who doesn't confess that Jesus Christ has come in the flesh is not of God, and this is the spirit of the Antichrist, of whom you have heard that it comes. Now it is in the world already.
John 1:14
The Word became flesh, and lived among us. We saw his glory, such glory as of the one and only Son of the Father, full of grace and truth.
1 Timothy 3:16
Without controversy, the mystery of godliness is great: God was revealed in the flesh, justified in the spirit, seen by angels, preached among the nations, believed on in the world, and received up in glory.

General references

Deuteronomy 18:21
If you say in your heart, "How shall we know the word which Yahweh has not spoken?"
John 8:47
He who is of God hears the words of God. For this cause you don't hear, because you are not of God."